Editing Epitope (section)

=== T cell epitopes ===
[[T cell]] epitopes<ref>{{cite journal | vauthors = Steers NJ, Currier JR, Jobe O, Tovanabutra S, Ratto-Kim S, Marovich MA, Kim JH, Michael NL, Alving CR, Rao M | display-authors = 6 | title = Designing the epitope flanking regions for optimal generation of CTL epitopes | journal = Vaccine | volume = 32 | issue = 28 | pages = 3509–16 | date = June 2014 | pmid = 24795226 | doi = 10.1016/j.vaccine.2014.04.039 }}</ref> are presented on the surface of an [[antigen-presenting cell]], where they are bound to [[major histocompatibility complex]] (MHC) molecules. In humans, [[Antigen-presenting cell#Professional APCs|professional antigen-presenting cell]]s are specialized to present [[MHC class II]] peptides, whereas most nucleated [[somatic cell]]s present MHC class I peptides. T cell epitopes presented by [[MHC class I]] molecules are typically peptides between 8 and 11 amino acids in length, whereas MHC class II molecules present longer peptides, 13–17 amino acids in length,<ref>{{cite book | vauthors = Alberts B, Johnson A, Lewis J, Raff M, Roberts K, Walter P |title=Molecular biology of the cell |date=2002 |publisher=Garland Science |location=New York |isbn=978-0-8153-3218-3 |edition=4th |page=1401 }}</ref> and non-classical MHC molecules also present non-peptidic epitopes such as [[glycolipid]]s.